“The technology is not at all far-fetched,’ ‘It involves the same techniques that people now suggest could be used to deflect asteroids or comets heading towards Earth. We don’t need raw power to move Earth, we just require delicacy of planning and maneuvering.” Dr. Greg Laughlin, Nasa Ames Research Center
In this scenario, in order to move the Earth the object should actually be the size of an asteroid. NASA’s plans explain how it will be possible to actually capture one, and how, in this way, the satellite will be used to affect Earth’s orbit and eventually pull it away from the Sun’s vicinity.
It’s not just the Sun’s evolution that can create issues for Earth’s future. Other apocalyptic scenarios include rogue asteroids with mass sufficient to trigger climate change similar to the doomed dinosaurs 65 million years ago or a near-Earth supernovae explosions (say, at 100 LY of distance). These can make future plans to change Earth’s orbit very relevant.